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hi i own a 2002 yamaha r6 and i am in desperate need of advice. I took my bike for a boot and the chain wipped off due to a loose front sprocket. As it came off it smashed into my crank case, breaking off a hole the size of a quarter. Now i took it to a machenic and to fix it they were giving me prices in the 2000+ doller range, because of all the labour in taking the engine apart and putting back together so i can either replace the crank casing or weld it back shut. So we took it a welder to see maybe if he could weld it from the outside and he said it cant be done due to the limited space and its gata be takin apart. Due to money issues i cant get it fixed that way so what i did was i applied jb weld around the hole and what seemed like a good fix turned out the opposite. as i started riding i sprung a leak and after resealing the hole it appeared ok for about 2 weeks of riding than, suddenly on the highway i sprung a leek again. Is there anyone who has delt with this issue and knows of a product or better way of fixing it?

Please and thank you for your advice
 

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IF you try to fix this with Epoxy (JB Weld, Marine-Tex,etc) you need to clean the heck out of it. I'm talking degreaser, acetone, carb cleaner, etc. When you're sure it's clean, start over and go through the whole routine again. Use a wire brush to be sure you get down into the pits in the metal. If it isn't clean it won't seal. I would suggest marine-tex instead of JB-Weld.

The best/cheapest/quickest option might be to look for a good replacement engine.
 

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yeah theres a better product called quicksteel its the epoxy putty i have used it before on small engines and it worked fine

and definetly make sure its clean also smoosh it into the hole a little so that it kind of mushrooms inside the engine then let it sit for like a week and cure so theres no doubt it isn't cured i also used it to repair a broken clutch cable mount on a 4 wheeler it still holding to this day good stuff

http://www.aerostich.com/catalog/US/QuickSteel-Epoxy-Putty-p-17056.html
 

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Take it to your Yamaha dealer, and ask them to check for recalls and tech bulletins. I know there was a tech bulletin on the countershaft sprocket nut and lock washer. If it was never done, see if they can get Yamaha to pick up the tab, or at least part of it.
 

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jb weld or if you can find someone to weld it for ya
 

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Take it to your Yamaha dealer, and ask them to check for recalls and tech bulletins. I know there was a tech bulletin on the countershaft sprocket nut and lock washer. If it was never done, see if they can get Yamaha to pick up the tab, or at least part of it.
Great idea, hopefully you're covered by the recall. If not, I agree that the Quick Steel or JB Weld stuff would work best for you. I used it on a radiator about two years ago and it is still holding to this day. Good luck with it.
 

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I know that this is years old but wanted to see if Yamaha Helped out with this, I had the exact same thing just happen to mine last week and it busted the exact same place as yours, the bearing is showing I mean its identical to your pics. Just thought I would ask.
 

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I wrecked pretty hard this year and had the same EXACT hole get slapped in my case. If I showed you a picture of it, you'd think I stole yours. I ended up taking mine to a welder around here and he fixed it for $170....I took off all of my plastics and he tipped the bike over on its side and did his thing.....He also has been known to be able to weld a beer can back together....(He's a badass...And a REALLY nice guy). Weld looks pretty much like the slap never happened.

Prior to seeking a specialist one of my friends had tried to fix it with JB Weld....It's such a high pressure high temp area that Oil came slicing through that Goo @ only 6000RPM @ 70MPH on the highway....Ask me how much fun running that bike home 2.5 miles fully geared with oily boots on a 90 degree day was. It wasn't.
 
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